JP2713230B2 - Input / output system in computer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input / output system in a computer system, and more particularly, to an input / output system which can be stopped / restarted for the purpose of changing SG parameters while the computer system is operating. Regarding output system.

[0002]

2. Description of the Related Art An input / output system of this type temporarily stores various data requested to be input / output from an application program in a buffer memory, that is, a storage area managed by the system (hereinafter referred to as a management storage area). hand,
This is software that efficiently controls data transfer between a central processing unit and an input / output device of a computer having different processing speeds. Some of such input / output systems include, for example, JP-A-5-274269 and JP-A-3-94.
As described in Japanese Patent Publication No. 44-44, etc., there is an apparatus having a security guard function for suppressing unauthorized (intentional) computer access from an unauthorized user.

Under the multitasking (multiprogramming), it is desired to change (enlarge or reduce) the size of the management storage area in accordance with the increase / decrease of the number of application programs using the input / output system, the use, the function, and the like. May be For example, when increasing the number of application programs that use the input / output system at the same time, or when starting up a database application, there may be cases where it is preferable to expand the management storage area in advance. When an application whose main purpose is computation is to be started, the efficiency may be improved by reducing the management storage area in advance and expanding the working area accordingly.

The size of the management storage area can be changed by changing the SG parameter.
Normally, parameters cannot be changed unless the input / output system is temporarily stopped and the management storage area is once opened. Conventionally, when changing the SG parameters, the input / output system is used prior to the stoppage of the input / output system, even though the input / output system can be stopped / restarted even while the computer system (OS) is operating. Simply wait for all application programs to exit, or
The program was forcibly terminated. As described above, the stop / restart of the input / output system after the termination of all the application programs is performed because the stop of the input / output system releases the management storage area.
Since the management storage area is reacquired by the restart, if the application program is left running, the management storage area allocated before the restart (after the restart, it is allocated to another application program) This is because there is a possibility that the user may accidentally access the area in which the information is stored, causing confusion, and to prevent such confusion.

[0005]

However, in the former method of simply waiting for the termination of all application programs, the input / output system cannot be stopped quickly, and an application program that is stalled due to a failure may fail. If so, the I / O system can no longer be stopped. In contrast, the latter method of forcibly terminating all application programs has the advantage that the input / output system can be stopped quickly, but uses the input / output system only at the beginning,
Thereafter, even application programs that are no longer used are forcibly terminated uniformly, and there is a problem of lack of specific validity.

The present invention has been made in view of the above circumstances, and has been made in consideration of the above circumstances, and has been made in view of the above circumstances.
The purpose is to provide an input / output system in a system.

[0007]

According to an aspect of the present invention, there is provided an input / output system capable of stopping / starting itself while a computer system is operating. Operation information storage means for storing operation information indicating whether the input / output system is in operation,
A generation information storage unit for storing generation information of the input / output system; a generation management updating unit for updating generation information stored in the generation information storage unit each time the input / output system is started; A start / stop request interface for acquiring the management storage area when the output system is started, and releasing the management storage area when the output system is stopped, and an arbitrary application / application during the operation of the input / output system.
When there is an input / output request from the program, if a copy of the generation information is not present in the management information of the application program, a copy of the generation information of the input / output system is added to the management information, and then the copy of the application program is performed. Is permitted, and if the management information of the application program includes a generation information copy that matches the generation information stored in the generation information storage means, the input / output request from the application program is permitted. If the management information of the application program includes a copy of generation information that does not match the generation information stored in the generation information storage unit, a generation management guard unit that rejects an input / output request from the application program. And the generation management guard means When the input / output request from the program is permitted, the management storage area is accessed according to the input / output request of the application program, and the result is notified to the application program. And an input / output request interface for notifying the application program that the management storage area is unusable when the input / output request is rejected.

According to a second aspect of the present invention, there is provided the input / output system according to the first aspect, wherein the generation management guard means includes means for inputting and outputting data from an arbitrary application program while the input / output system is stopped. When a request is made, a function of rejecting an input / output request from the application program is added.

The invention according to claim 3 is the input / output system according to claim 1 or 2, wherein the generation information is
The input / output system is characterized by being composed of start time data.

According to a fourth aspect of the present invention, in the input / output system according to the third aspect, the start time is displayed up to microseconds.

[0011]

In the structure of the present invention, the generation information storage means stores generation information of the input / output system. The generation information is updated by the generation management updating means each time the input / output system is started. The start / stop request interface acquires the management storage area when the input / output system is started, and releases the management storage area when the input / output system is stopped. The generation management guard means refers to the generation information stored in the generation information storage means when the input / output request of the application program includes a generation information copy in the management information of the application program. Then, by comparing the generation information with the copy of the generation information existing in the management information, it is determined whether the request is an input / output request for the management storage area after the restart. If the result of this determination is that they do not match, it means that the generations are different (in other words, between the two generations, the
Since this acquisition has been experienced)
By rejecting the input / output request of the program 3, the danger of accessing a predetermined area of the management storage area which may be used by another application program is prevented. On the other hand, if they match, it is an access request to the management storage area after the restart, so that access to the management storage area is permitted.

Therefore, the input / output system can be stopped quickly and safely while the application program is running. Therefore, an application program that uses the input / output system only at the beginning but does not use the input / output system afterwards does not have to be forcibly terminated due to the stop of the input / output system. . In addition, microseconds (μ
If the start time displayed up to sec) is adopted, even if the stop / restart is performed within a very short time, the difference between the generations can be reliably identified.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an electrical configuration of an input / output system in a computer system according to an embodiment of the present invention, and a diagram for explaining an operation of the input / output system. The input / output system of this example is used for data transfer control between an external storage device (input / output device) and a main storage, and is used for recovery of input / output errors and SG.
Changing parameters (enlarging or reducing the size of the management storage area)
This is the same as the conventional input / output system in that the input / output system is executed. Focusing on the concept, it is greatly different from the conventional input / output system in that it has a function of preventing erroneous access by generation management.

As shown in FIG. 1, the input / output system 1 of this example includes a start / stop request interface program 2 for receiving a start / stop request from the input / output system administrator MG, and an optional application program 3 Input / output request interface program 4 for receiving an input / output request from a user, and a generation information operation information storage area (hereinafter simply referred to as a generation information storage area) 5 for recording generation information 51 and operation information 52 of the input / output system 1. And a management storage area (buffer memory) 6 for temporarily storing various data 31 requested to be input / output from the application program 3. The input / output system administrator (operator) MG is a person who properly maintains the state of the input / output system 1 and provides services to the user. Specifically, maintenance of the input / output system 1, change of SG parameters, The input / output system 1 is started / stopped for recovery from a failure or the like.

When the start / stop request interface program 2 receives a start request from the input / output system manager MG, it acquires the management storage area 6 in the main memory. This is a resident program that releases the area 6, and the generation management update routine 21
have. The generation management update routine 21 updates the operation information 52 of the input / output system 1 stored in the generation information storage area 5 every time a start / stop request is received from the input / output system administrator MG. When the activation request is received, processing for updating the generation information 51 of the input / output system 1 stored in the generation information storage area 5 is also performed.

Here, the generation information 51 refers to the number of times the input / output system 1 is stopped / operated several times during operation of the computer system.
When restarting is repeated, this information is information indicating the generation (operation time) of the input / output system 1 and does not need to be able to recognize a specific generation (the number of startups), and is the current generation or a previous generation. Information that can identify whether or not is sufficient, for example, a start time displayed up to microseconds (μsec), numerical information that is incremented each time the start is performed, and the like,
It can be suitable generation information. The operation information 52 is:
This flag indicates the operation state of the input / output system 1, that is, whether the input / output system 1 is operating or stopped.

Each application program 3 is assigned a data memory area for storing various data 31 and a management information memory area for storing management information 32 in a main memory. 32a is included. Here, generation information copy 32
“a” is a copy of the generation information 51 stored in the generation information storage area 5, and at this copy time, each application program 3 first makes an I / O request while the I / O system 1 is operating. It is when. Therefore, when a start time displayed up to microseconds (μsec) is adopted as the generation information 51, a copy of this start time is the generation information copy 32a. Therefore, copy of generation information 3
The content of 2a includes a plurality of application programs 3
If the input / output system 1 repeatedly stops / restarts during the operation of the application program, the application program 3 that has issued the input / output request for the first time during the current operation and the first input / output request during the previous operation or before the last operation are performed. This is different from the application program 3.

I / O request interface program 4
When an input / output request from an arbitrary application program 3 is received, it is determined whether or not the access is valid. If it is determined that the access is valid, the input / output request received from the application program 3 is managed. On the other hand, if it is determined that the access is illegal (erroneous), the resident program notifies the application program 3 that the input / output system 1 cannot be used. It has a generation management guard routine 41 for judging whether or not this is the case. More specifically, the generation management guard routine 41 stores the operation information 5 from the generation information storage area 5 when an input / output request is received from any running application program 3.
2 to determine whether or not the input / output system 1 is currently operating. If the input / output system 1 is operating, refer to the generation information copy 32a from the management information 32 of the input / output request source (application program 3). On the other hand, by referring to the generation information 51 from the generation information storage area 5, the two are compared, and it is monitored whether or not the access is unauthorized. Here, generation information copy 3
If the start time of 2a does not match the start time of the generation information 51, it is determined that the access is unauthorized. This is because the first input / output request of the application program 3 is made during the operation before the restart of the input / output system 1, and is stored in the management storage area 6 before the restart of the application program 3. Is no longer available and may now be assigned to another application program 3 or removed from the management storage area 6.

The management storage area 6 exchanges data between a data memory area and a management information memory area allocated to the application program 3 and an external storage device 7 such as an optical disk device, an electronic disk device, or a magnetic disk device. This is a storage area for temporarily storing compatible data, is acquired in the main memory when the input / output system 1 is started, and is released when the input / output system is stopped.

Next, the operation of this embodiment will be described. (1) Operation of Start / Stop Request Interface Program 2 First, the operation of the start / stop request interface program 2 will be described with reference to FIG. For example, the input / output system administrator MG stops the input / output system 1 during the operation of the computer system, changes SG parameters (enlarges or reduces the size of the management storage area 6), and then restarts the computer. Perform the operation. This restart operation is started /
This is performed by issuing a start request of the input / output system 1 to the stop request interface program 2. The start / stop request interface program 2 receives a start request from the input / output system administrator MG (#
1) First, the management storage area 6 is acquired in the main storage (#
2) Then, the acquired management storage area is initialized (# 3), and thereafter, the generation management update routine 21 is executed, and the generation of the I / O system 1 stored in the generation information storage area 5 is executed. The information 51 and the operation information 52 are updated (#
4). The generation information 51 is updated by, for example, rewriting the previous activation time with the current activation time, and updating the operation information 52 is performed by rewriting “stopped state” to “operating state” (setting a flag). It is done by that.
When the update processing of the generation management update routine 21 is completed, the start / stop request interface program 2 ends the start processing. Thereafter, the operation of the input / output system 1 is started (# 5).

When the SG parameters need to be changed again during the operation of the computer system, the input / output system manager MG sends the input / output request program 1 to the start / stop request interface program 2. Make a stop request. Start / stop request interface program 2
Receives the stop request from the input / output system administrator MG (# 6), executes the generation management update routine 21, and executes the contents of the operation information 52 of the input / output system 1 stored in the generation information storage area 5. ("Operating state") is rewritten to "stop state" (the flag is lowered) (# 7). When the update processing of the generation management update routine 21 is completed, the start / stop request interface program 2 performs the release processing of the management storage area 6 without waiting for the end of the currently operating application program 3 (# 8). ), And terminates the stop processing. Thereafter, the operation of the input / output system 1 is stopped (# 9).

(2) Operation of Input / Output Request Interface Program 4 Next, the operation of the input / output request interface program 4 will be described with reference to FIG. When an arbitrary application program 3 in operation exchanges data with the external storage device 7, it issues an input / output request to the input / output system 1. When receiving the input / output request from the application program 3 (SP1), the input / output request interface program 4 executes the generation management guard routine 41 to perform the following processing. First, the operation information 52 is referred to from the generation information storage area 5 (SP2), and it is determined whether or not the input / output system 1 is operating (SP3). If the result of this determination is that the input / output system 1 is in a halt state, the input / output request of the application program 3 is rejected. When the input / output request of the application program 3 is rejected by the generation management guard routine 41, the input / output request interface program 4 notifies the application program 3 of the unavailability of the input / output system 1 ( SP4), and ends the input / output processing. Therefore,
The application program that has been notified of the unusable state ends once, waits until the input / output system 1 is restarted, and cannot use the input / output system 1 unless it is also restarted.

On the other hand, when the input / output system 1 is in operation (SP3), the generation management guard routine 41
With reference to the management information 32 of the input / output request source (application program 3) (SP5), the generation information copy 32a
It is checked whether or not exists (SP6). As a result, if the generation information copy 32a does not exist in the management information 32 (in the case of “No” in SP6), this application
Since this is the first input / output request for the program 3, a copy (generation information copy 32a) is created by referring to the generation information 51 from the generation information storage area 5, and
Copy the created generation information copy 32a with this application
After adding to the management information 32 of the program 3 (SP7),
The input / output request of the application program 3 is permitted. The input / output request interface program 4
When the generation management guard routine 41 permits the input / output request of the application program 3,
According to the input / output request of the application program 3, input / output (access) is performed (SP8), and after the execution result is notified to the application program 3, the input / output processing ends.

On the other hand, if the generation information copy 32a exists in the management information 32 (“Yes” in SP6), the generation management guard routine 41 stores the generation information 51 Is read (SP9) and compared with the generation information copy 32a of the management information 32 (SP1).
0). As a result of this comparison, generation information 51 and generation information copy 3
If 2a does not match, the currently operating I / O system 1 and the I / O system 1 that was operating when the application program 3 first made an I / O request
Since the generations are different from each other (that is, since the release and acquisition of the management storage area 6 has been experienced between the two generations), the input / output request of the application program 3 is rejected. When the generation management guard routine 41 rejects the input / output request of the application program 3, the input / output request interface program 4 sends the input / output system 1 to the application program 3.
Is notified (SP4), the input / output processing ends. Therefore, the application program notified of the unusable state cannot use the input / output system 1 unless it is once terminated and restarted.

On the other hand, the generation management guard routine 41
If it is determined that the generation information 51 matches the generation information copy 32a, the input / output system 1 that is currently running and the input / output system that was running when this application program 3 first made an input / output request 1 is the same generation (that is, since the release / acquisition of the management storage area 6 has not been experienced between the current I / O request and the first I / O request), the application program 3
Permit I / O requests. I / O request interface
When the input / output request of the application program 3 is permitted by the generation management guard routine 41, the program 4
Input / output (access) according to the input / output request of (S)
P8) After notifying the application program 3 of the execution result, the input / output processing ends.

As described above, according to the configuration of this example, when an input / output request of the application program 3 is received, it is determined whether or not the input / output request is for the management storage area 6 after the restart. If the result of this determination is that the input / output request is for the management storage area 6 before the restart, access to the management storage area 6 is rejected, so that erroneous access can be prevented. Therefore, the application
While the program 3 is running, the input / output system 1 can be stopped immediately and safely, and for example, SG parameters can be changed quickly. Therefore, for the application program 3 that uses the input / output system 1 only at the beginning but does not use the input / output system 1 thereafter, there is no fear of the forced termination due to the stop of the input / output system 1, so that the input / output system that is very easy to use is used. The system 1 is set. In addition, if a start time displayed up to microseconds (μsec) is adopted as the generation information 51, a difference between generations can be surely identified even when stop / restart is performed within a short time.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like that do not depart from the gist of the present invention. Is also included in the present invention. For example, the generation information is not limited to a start time displayed up to microseconds (μsec), numerical information that is incremented each time the start is performed, and the like. In short, the first I / O request of any application program is after restart (after this start)
If the data indicates whether the processing was performed before the restart (before the current startup), the data can be used as generation information.

[0028]

As described above, according to the input / output system of the present invention, when an input / output request from an application program is received, it is determined whether or not the input / output request is for the management storage area after the restart. As a result of this determination, if the request is an I / O request to the management storage area after the restart, access to the management storage area is permitted, but if the request is an I / O request to the management storage area before the restart. Rejects access to the management storage area because it may access a predetermined area of the management storage area which may be used by another application program now. Therefore, the input / output system can be stopped / started safely and quickly while the application program is running. Therefore, an application program that uses the input / output system only at the beginning but does not use the input / output system afterwards does not have to be forcibly terminated due to the stop of the input / output system. .

[0027]

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of an input / output system in a computer system according to an embodiment of the present invention, and a diagram for explaining an operation of the input / output system.

FIG. 2 is a diagram for explaining the operation of the embodiment, and more specifically, is a flowchart for explaining the operation of a start / stop request interface program (generation management update routine).

FIG. 3 is a diagram for explaining the operation of the embodiment, and more specifically, is a flowchart for explaining the operation of an input / output request interface program (generation management guard routine).

[Explanation of symbols]

Reference Signs List 1 input / output system 2 start / stop request interface program (start / stop request interface) 21 generation management update routine (generation management update means) 3 application program 32 management information 32a generation information copy 4 input / output request interface program (input Output request interface) 41 generation management guard routine (generation management guard means) 5 generation information storage area (operation information storage means, generation information storage means) 51 generation information 52 operation information 6 management storage area 7 external storage device

Claims (4)

(57) [Claims] 1. An input / output system capable of stopping / starting itself while a computer system is operating, an operation information storage means for storing operation information indicating whether or not the input / output system is operating. A generation information storage unit that stores generation information of the input / output system, and a generation management update unit that updates the generation information stored in the generation information storage unit each time the input / output system is activated, A start / stop request interface for acquiring the management storage area when the input / output system is started, and releasing the management storage area when the input / output system is stopped; and input / output from any application program while the input / output system is operating. When there is a request, if there is no generation information copy in the management information of the application program, the input / output The generation information copy systems out after applying to the management information application
If an input / output request from the application program is permitted and a copy of generation information that matches the generation information stored in the generation information storage unit exists in the management information of the application program, the input / output request from the application program is accepted. Generation management that rejects an input / output request from the application program if the management information of the application program includes a generation information copy that does not match the generation information stored in the generation information storage means. A guard means, and the generation management guard means
When an input / output request from the program is permitted, the management storage area is accessed in accordance with the input / output request of the application program, and the result is stored in the application program.
An input / output request interface for notifying the application program that the management storage area is unavailable when the generation management guard means rejects an input / output request from the application program. An input / output system in a computer system. 2. The generation management guard means rejects an input / output request from an application program when there is an input / output request from an arbitrary application program while the input / output system is stopped. 2. The input / output system in the computer system according to claim 1, wherein a function is added. 3. The input / output system according to claim 1, wherein the generation information includes start time data of the input / output system. 4. The input / output system according to claim 3, wherein the start time is displayed up to microseconds.